GeologyRocksCrustal melting at subduction zones.
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dehydration
Mon, 08/31/2009 - 00:50The descending plate, being former ocean floor, is already hydrated. The rise in temperature as the plate descends causes partial melting, aided by the lower melting point due to the hydration. The increased temperature will also drive off water, causing dehydration.
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hello every body ... i
Tue, 10/06/2009 - 08:28hello every body ...
i want fo add some more important stuff regarding melting and dehydration along the subduction zone.actually the phenomenon is this that due to the subduction of the oceanic crust that extends towards the asthenosphere, partial meltind of the subducted plate starts causing the escap of certain volatile material like water and carbondioxide, being volatile the will escape first and become responsible for the dehydration.
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hello every body ... i
Tue, 10/06/2009 - 08:28hello every body ...
i want fo add some more important stuff regarding melting and dehydration along the subduction zone.actually the phenomenon is this that due to the subduction of the oceanic crust that extends towards the asthenosphere, partial meltind of the subducted plate starts causing the escap of certain volatile material like water and carbondioxide, being volatile the will escape first and become responsible for the dehydration.
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Crustal melting at subduction zones.
Submitted by glossterline on Sun, 08/30/2009 - 13:43.I suspect that this question will reach Jon's attention, because it concerns the mysteries of the melting process at a subduction zone. I have read that the descending plate of oceanic crust dehydrates and then melts, but I thought that lowering of melting points was caused by hydration. This is contradictory to me, unless the water produced during dehydration lowers the MP of another component of the system. What is happening?